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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 722 · 40 questions
TalentJR

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

NameDateTime takenScore ___ / 40
  1. 1.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  3. 3.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
  5. 5.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  6. 6.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  7. 7.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
  8. 8.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  9. 9.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  10. 10.🦾 A servo moves from 120° to 140°. How many degrees does it turn?
  11. 11.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  12. 12.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  14. 14.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  15. 15.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
  16. 16.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and left (b) points right (c) points straight up (d) points up and right
  17. 17.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
  18. 18.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points straight up (b) points up and right (c) points up and left (d) points right
  19. 19.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  21. 21.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  22. 22.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  23. 23.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
  25. 25.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  26. 26.🦾 A servo moves from 50° to 60°. How many degrees does it turn?
  27. 27.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  29. 29.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  30. 30.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  31. 31.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and right (b) points up and left (c) points left (d) points straight up
  32. 32.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
  33. 33.🦾 A servo moves from 140° to 0°. How many degrees does it turn?
  34. 34.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  35. 35.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  37. 37.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  38. 38.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
  39. 39.🦾 A servo moves from 130° to 150°. How many degrees does it turn?
  40. 40.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True

Answer key

  1. a servo motor
  2. 100
  3. False
  4. a DC motor
  5. 30
  6. True
  7. 40
  8. 40
  9. False
  10. 20
  11. False
  12. 160
  13. 250
  14. True
  15. 80
  16. points up and right
  17. 110
  18. points right
  19. a servo motor
  20. a DC motor
  21. a servo motor
  22. True
  23. a DC motor
  24. a servo motor
  25. False
  26. 10
  27. 50
  28. a servo motor
  29. True
  30. a DC motor
  31. points left
  32. 180°
  33. 140
  34. False
  35. True
  36. 50
  37. 80
  38. swap its two wires
  39. 20
  40. False

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